How much do solar panels cost in the UK?The average cost of a solar panel system in the UK in 2026 is £6,000 to £8,000 for a typical 3.5kWp system (10 to 12 panels) including installation. Larger systems for bigger homes cost £8,000 to £15,000. Prices have fallen around 15 to 20% since 2022 due to falling panel costs, though installation labour remains the main cost driver. Average solar panel installation cost UK 2026: £6,000 to £8,000 for a 3.5kWp system. No VAT applies — solar panels are zero-rated for VAT. Payback period: typically 8 to 12 years. Solar panel costs by system size UK 2026
How much can solar panels save on bills?A typical 3.5kWp system generates approximately 3,000 to 3,500 kWh of electricity per year in the UK. At the April 2026 price cap rate of 24.50p per kWh, this could save approximately £735 to £858 per year if all generated electricity replaces grid power. In practice, savings are typically £400 to £700 per year, as some generated electricity is exported rather than used. Smart Export Guarantee (SEG) paymentsElectricity you generate but do not use is exported to the grid. Under the Smart Export Guarantee (SEG), energy suppliers must offer you a tariff for this exported electricity. Current SEG rates range from 1p to 20p per kWh depending on the supplier and tariff. Octopus Energy and Ovo Energy offer some of the best export rates. Solar panel payback period UK
Is solar worth it in the UK?
Verdict Worth it for most homeowners with suitable roofs At 2026 electricity prices, solar panels pay back in 8 to 12 years and last 25 to 30 years — delivering 15 to 20 years of near-free electricity. The case is strongest for EV owners who can use solar generation to charge overnight via a battery or during the day. Frequently asked questionsDo solar panels work in the UK climate? Yes. Solar panels generate electricity from daylight — not direct sunshine — so they work even on overcast days. The UK generates around 60 to 70% of the output you would get in southern Europe, which is sufficient for a positive return. Is there VAT on solar panels in the UK? No. Solar panel systems are zero-rated for VAT in the UK, making installation effectively VAT-free. This applies to the panels and installation costs. How long do solar panels last? Most solar panels come with a 25-year performance guarantee and last 30 years or more. Output degrades at around 0.5 to 1% per year, so panels are typically producing 85 to 90% of original output after 20 years. Do I need planning permission for solar panels? Most residential solar panel installations are permitted development and do not need planning permission. Exceptions include listed buildings, conservation areas, and panels that protrude more than 200mm above the roof surface. |
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